开发者文档里手电筒有三种状态,分别为关闭、开启以及自动:
typedef NS_ENUM(NSInteger, AVCaptureFlashMode) {
AVCaptureFlashModeOff = 0,
AVCaptureFlashModeOn = 1,
AVCaptureFlashModeAuto = 2,
} API_AVAILABLE(macos(10.7), ios(4.0), macCatalyst(14.0)) API_UNAVAILABLE(tvos) API_UNAVAILABLE(watchos);
AVCaptureTorchModeOff表示手电筒关闭,AVCaptureTorchModeOn表示手电筒打开,AVCaptureTorchModeAuto表示根据环境光线条件自动使用手电筒。
使用方法:
//开启+关闭手电筒
-(void)setFlashlight{
AVCaptureDevice *device =[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//修改前必须先锁定
[device lockForConfiguration:nil];
//必须判定是否有闪光灯,否则如果没有闪光灯会崩溃
if([device hasFlash]) {
if(device.torchMode==AVCaptureFlashModeOff) {
device.torchMode=AVCaptureTorchModeOn;
}else if(device.torchMode==AVCaptureFlashModeOn) {
device.torchMode=AVCaptureTorchModeOff;
}
}
[device unlockForConfiguration];
}